【摘要】 通过极限氧指数（LOI）、线性燃烧速率（LBR）、热重分析和锥形量热分析等技术手段研究膨胀型阻燃剂（IFRs）中三聚氰胺聚磷酸盐（MPP）和季戊四醇（PER）的质量比、组成为m（MgO）:m（可膨胀石墨,EG）:m（SiO₂）=1:5:5的协效剂组（MgO/EG/SiO₂）和硅烷偶联剂（KH550）对聚丙烯基木塑复合材料（WPC）阻燃性能的影响。结果表明,当IFRs中m（MPP）:m（PER）=23:2（IFRs-M1）、质量分数为25%时的阻燃性能最佳,膨胀阻燃复合材料WPC/IFRs-M1的LOI和LBR分别为27. 1%和3. 89 mm/min,较未添加的WPC分别提高48. 1%和下降89. 79%,燃烧时的热释放速率、总热释放量、总烟释放量和CO₂释放量分别降低了76. 2%、50. 1%、6. 9%和65. 4%,600℃时的残炭率提高了498. 3%。协效剂组和KH550表面处理均可进一步改善WPC/IFRs-M1的阻燃性能,均对IFRs-M1具有良好的阻燃增效作用。相比于WPC/IFRs-M1,同时用这两种阻燃增效手段的WPC/IFRs-M1/MgO/EG/SiO₂/KH550,其LOI提高了3. 7%,LBR降低了20. 3%;材料的热稳定性明显提高,热失重降低;燃烧时的热释放速率、总热释放量、总烟释放量和CO₂释放量分别降低了36. 5%、37. 6%、57. 5%和33. 33%,600℃时的残炭率提高了84. 02%,显示出二者更好的协同效应。更多还原

【Abstract】 The effect of the mass ratio and composition of melamine polyphosphate（ MPP）/pentaerythritol（ PER） in intumescent flame retardants（ IFRs）,synergist group MgO/EG/SiO₂ of which composition with m（ MgO）: m（ expandable graphite,EG）: m（ SiO₂） = 1:5:5,and the silane coupling agent KH550 on the flame retardancy of polypropylene-based wood-plastic composites（ WPC） were studied by means of limiting oxygen index（ LOI）,linear burning rate（ LBR）,thermogravimetric analysis and cone calorimetry. The results show that when m（ MPP）: m（PER） = 23:2 in IFRs（ code IFRs-M1） and its mass fraction is 25%,the flame retardant performance is the best,and LOI and LBR of the intumescent flame retardant composite WPC/IFRsM1 are 27. 1% and 3. 89 mm/min,respectively,which are 48. 1% higher and 89. 79% lower than those of the unadded WPC. Compared with the unadded WPC,the heat release rate and total heat release during combustion decrease by 76. 2% and 50. 1%,the carbon residue rate at 600 ℃ increases by 498. 3%,the total smoke emission reduces by 6. 9%,and the release of CO₂ drops by 65. 4%. It also indicates that both the synergist group and KH550 surface treatment can further improve the flame retardant properties of WPC/IFRs-M1,and both have good flame retardant synergistic effect on IFRs-M1. Compared with WPC/IFRs-M1,LOI of WPC/IFRs-M1/MgO/EG/SiO₂/KH550 with both flame retardant means mentioned above is enhanced by 3. 7%,and its LBR declines by 20. 3%. At the same time,its thermal stability significantly improves,the thermal weight loss goes down,and its heat release rate and total heat release during combustion reduce by 36. 5% and 37. 6%,respectively. Its carbon residue rate at 600 ℃ increases by 84. 02%,the total smoke release reduces by 57. 5%,and the amount of CO₂ release reduces by 33. 33%,indicating a better synergistic effect.更多还原